Back-pedaling brake



(No Model.)

R. H. GANPIELD. BACK PEDALING BRAKE. No. 602,974. Patented Apr, 26,1898.

W a. W

A A 2 I WHW W o UNITED STATES PATENT- Enron..

ROBERT H. CANFIELD, OF CORNING, NE,T YORK.

BACK-PEDALING BRAKE.

SPECIFICATION forming part of Letters Patent No. 602,974, dated. April26, 1898.

Application filed May 19, 1896.

To all whom it may concern:

Beit known that I, ROBERT H. CANEIELD, of Corning, county of Steuben,and State of New York, have invented a new and useful improvement inVelocipede-Brakes, of which the following is a specification.

My invention relates to that class of brakes in which the brake isthrown into action by the operation of back-pedaling.

The object of the invention is to provide a simple, efficient, andinexpensive brake of the class referred to.

The invention consists in the construction and combinations hereinafterdescribed, and pointed out in the claims.4

Referring to the drawings, Figure l is a sectional view showing aportion of the rear bicycle-wheel, its sprocket, and axle with myimproved brake mechanism applied. Fig. 2 is a similar View slightlymodified. Fig. 3 is a side elevation thereof. Fig. fi is a sectionalview of a further modification, in which the brake mechanism is appliedto the pedalshaft, its sprocket, and the box or bearing; and Fig. 5isalongitudinal section through the rear bearing of a bicycle, showingthe brake surface integral with the sprocket-wheel and the faces of thebrake-surfaces furnished with leather.

In Figs. l., 2, and 3, N represents the rear end portion of abicycle-frame provided with the usual fork or slot N', in which ismounted the rear axle P, on which rotates the hub R of the rear wheel.The hub R is provided at one end, adjacent to its spoke-flange, with acoarse screw-thread R', and the sprocketwheel D has its bore threaded,as at D', to correspond therewith and is loose on this threaded portionR', so that when the sprocketchain D applies power to the sprocket in adirection to drive it forwardly the sprocket will bind against the spokeflange or end of the hub and thereby cause the rear wheel to rotate withthe sprocket; but when the rider resorts to back-pedaling` the chainwill reverse itsstrain on the sprocket-wheel and cause it to rotatebackwardly on the hub, and consequently move longitudinally along saidhub toward the outer end thereof, owing to the coarse screw-threadedconnection therewith.

Serial No. 592,185. (No model.)

The outward movement of the sprocket D along its hub is limited by thenut H and washer K.

C is a brake-disk fixed to the outer face of the sprocket D to contactwith a stationary brake-disk B when the sprocket is forced outwardly byback-pedaling. This stationary brake-disk is provided with a centralaperture for the free passage of axle P and with a lug B', which entersthe slot or fork N' and holds the disk B from rotation.

Owing to the pitch of the threads R D the brake will be quickly appliedand released, and the operatcrs sense of feeling will soon enable him toregulate the application of the brake with nicety.

The adjacent faces of the brake-disks C B may either or both be providedwith leather or other suitable material, if desired, as shown in Fig. 5.

ln the above construction the disk C may be secured to or formedintegral with the sprocket-wheel, as shown in Fig. 5; but, if desired,the disk C may be omitted and the face of the sprocket contact with thestationary braking-surface B, as shown in Fig. 2. In this constructionthe inner face of the stationary bra'kin g surface or disk B is providedwith an annular channel I), in which is fitted a ring B2, of leather orother suitable material, to contact with the friction-face of thesprocket-wheel. This friction face or surface of the sprocket D may beformed in any desired manner, just so long as the principle is preservedof having the sprocket act as a brake during back-pedaling by movinglaterally along the hub into engagement with a fixed or stationaryfriction-surface, whether the same be applied to or formed as anintegral part of the frame.

O is the usual nut on the outer end of the axle, and X is the usualscrew for adjusting the axle.

Referring now to Fig. Il, it will be seen that the principle involvedmay be readily applied to the pedal-sprocket and adjacent parts. In

this figure A represents the stationary box or bearing for thepedalshaft E, and B3 is the stationary friction-surface, consisting of aring or iiange secured to or formed on the end of IOO the box orbearing. vided with the coarse screw-threads E', on which thedriving-sprocketD2 turns and slides after the manner of the rearsprocket D on its hub, as when the pedaling is forward thesprocket-Wheel will move out\vard,bind on the shoulder E2, and turn withshaft E; but when back pedaling is resorted to the sprocketwheel D2 willmove inwardly along its shaft into engagement with the stationaryfrictionsurface B3. They sprocket D2 may contact directly With surfaceB3 or indirectly through the medium of a ring C of any suitablematerial. H is the stop nut or ring on the axle E to limit the movementof the sprocket-wheel D2 toward the stationary surface B3, and K is aWasher in the form of a cushioning-sprin g and interposed between thenut H and they sprocket-wheel to cushion the movement of the sprockettoward said stationary surface. F is one of the crank-arms of thepedal-shaft.

In Fig. 5 I have shown a longitudinal section through the rearsprocket-wheel and its bearing, in which it will be seen that thesprocket-wheel has the bearing-disk C formed integral therewith and inwhich -it will be further seen that the faces of the twobrakingsurfacesthat carried by the sprocket-wheel and the fixed surfaceB-are provided with a facing of leather or other suitable material B.

I do not claim herein the combination, broadly, of a rotatable shafthaving a screwthreaded portion, a non-rotatable brake-surface adjacentthereto, and a screw-threaded driving-wheel mounted upon the threadedportion of the shaft, having a limited rotation thereon and providedwith a friction-surface for engaging with the non-rotatable surface whenthe driving-wheel is rotated relatively with the shaft; but

The pedal-shaft is pro- A What I do claim, and desire to secure byLetters Patent, is as follows:

l. In a bicycle or analogous machine, the combination with the frame, ofa rotary driving member mounted therein, a fixed brakesurface mounted onthe axis thereof, a laterally-acting brake-wheel movable along the axisof said member and adapted to coact with the iixed brake-surface, and anadjustable device situated between the fixed brake-surface and themovable brake-wheel, and serving to limit the lateral movement of thelatter.

2. In a bicycle or analogous machine, the combination with thedriving-wheel and driving means, of a iixed brake-disk mounted on theaxis of said wheel, a laterally-moving brake-Wheel mounted on the hub ofthe drivewheel, and adapted to coact with the Iixed disk, and anadjustable nut screwed on the end of the hub between the fixedbrake-disk and the movable brake-wheel and serving to limit the lateralmovement of the latter.

.3. In a bicycle or analogous machine the combination with a rotarydriving member.

.of a fixed brake-surface, a laterally-acting brake-wheel movable alongthe axis of the rotary member, an adjustable stop-nut situated betweenthe fixed brake-surface and the movable brake-wheeh'and a cushioningdevice independent of said brake device and situated between thestop-nut and the movable brake-wheel.

In testimony whereof I hereunto set my hand, this 6th day of May, 1896,in the presence of two attesting witnesses.

ROBERT H. CANFIELD.

Witnesses:

J T. KERST, E. A. AvERE'rT.

